package in.bench.resources.java8.zoneddatetime.examples;

import java.sql.Timestamp;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

public class DifferentWaysToConvertJavaUtilDateToZonedDateTime {

	public static void main(String[] args) {

		// get current date
		Date date = new Date();
		System.out.println("Current Date is = " + date);


		// print to console
		System.out.println("\njava.util.Date to java.time.ZonedDateTime conversion :-");
		System.out.println("-----------------------------------------------------");


		// 1. Using java.sql.Date & Timestamp & atZone() method
		java.sql.Date sqlDate = new java.sql.Date(new java.util.Date().getTime());
		Timestamp timestamp1 = new java.sql.Timestamp(sqlDate.getTime());
		LocalDateTime localDateTime1 = timestamp1.toLocalDateTime();
		ZonedDateTime zonedDateTime1 = localDateTime1.atZone(ZoneId.systemDefault());
		System.out.println("1. Using java.sql.Date & Timestamp & atZone() method :- \n" 
				+ zonedDateTime1);


		// 2. Using Timestamp & atZone() method
		Date date2 = new Date();
		Timestamp timestamp2 = new Timestamp(date2.getTime());
		LocalDateTime localDateTime2 = timestamp2.toLocalDateTime();
		ZonedDateTime zonedDateTime2 = localDateTime2.atZone(ZoneId.systemDefault());
		System.out.println("\n2. Using Timestamp & atZone() method :- \n" 
				+ zonedDateTime2);


		// 3. Using LocalDateTime.parse() & atZone() methods
		Date date3 = new Date();
		LocalDateTime localDateTime3 = LocalDateTime.parse(
				date3.toString(),
				DateTimeFormatter.ofPattern("EEE MMM dd HH:mm:ss zzz yyyy")
				);
		ZonedDateTime zonedDateTime3 = localDateTime3.atZone(ZoneId.systemDefault());
		System.out.println("\n3. Using LocalDateTime.parse() & atZone() methods :- \n" 
				+ zonedDateTime3);


		// 4. Using GregorianCalendar and toZonedDateTime() method
		Date date4 = new Date();
		GregorianCalendar gregorianCalendar = (GregorianCalendar) Calendar.getInstance();
		gregorianCalendar.setTime(date4);
		ZonedDateTime zonedDateTime4 = gregorianCalendar.toZonedDateTime();
		System.out.println("\n4. Using GregorianCalendar and toZonedDateTime() method :- \n" 
				+ zonedDateTime4);


		// 5. Using Instant & toInstant() method
		Date date5 = new Date();
		Instant instant5 = date5.toInstant();
		ZonedDateTime zonedDateTime5 = instant5.atZone(ZoneId.systemDefault());
		System.out.println("\n5. Using Instant & toInstant() method :- \n"
				+ zonedDateTime5);


		// 6. Using Instant & ZonedDateTime
		Date date6 = new Date();
		Instant instant6 = Instant.ofEpochMilli(date6.getTime());
		ZonedDateTime zonedDateTime6 = instant6.atZone(ZoneId.systemDefault());
		System.out.print("\n6. Using Instant.ofEpochMilli() & atZone() methods :- \n"
				+ zonedDateTime6);
	}
}

Current Date is = Sat Aug 13 17:50:21 IST 2022

java.util.Date to java.time.ZonedDateTime conversion :-
-----------------------------------------------------
1. Using java.sql.Date & Timestamp & atZone() method :- 
2022-08-13T17:50:21.787+05:30[Asia/Calcutta]

2. Using Timestamp & atZone() method :- 
2022-08-13T17:50:21.882+05:30[Asia/Calcutta]

3. Using LocalDateTime.parse() & atZone() methods :- 
2022-08-13T17:50:21+05:30[Asia/Calcutta]

4. Using GregorianCalendar and toZonedDateTime() method :- 
2022-08-13T17:50:22.010+05:30[Asia/Calcutta]

5. Using Instant & toInstant() method :- 
2022-08-13T17:50:22.025+05:30[Asia/Calcutta]

6. Using Instant.ofEpochMilli() & atZone() methods :- 
2022-08-13T17:50:22.025+05:30[Asia/Calcutta]